Benchmark: Array.prototype.concat vs spread operator vs push without jQuery

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
Push
var params = [ "hello", true, 7 ]; params.push(1); params.push(2);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Push

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.192 Safari/537.36

Browser/OS: Chrome 88 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	6096770.0 Ops/sec
spread operator	28056620.0 Ops/sec
Push	39682160.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):

LLMs can make mistakes. Check important info.

Let's break down the provided JSON benchmark and explain what's being tested, compared options, pros and cons of each approach, and other considerations.

**Benchmark Definition:**

The test compares three approaches to concatenate arrays in JavaScript:

1. `Array.prototype.concat()`
2. The new ES6 spread operator (`...`)
3. The `push()` method without using the spread operator

**Options being compared:**

* `Array.prototype.concat()`: A traditional method for concatenating arrays, which adds a new array object to the end of an existing array.
* Spread operator (`...`): A modern and concise way to create a new array by spreading elements from an existing array or iterable.
* `push()` method without using spread operator: This approach involves adding elements to the end of an array using the `push()` method, which can be less efficient than using `concat()` or spread operator.

**Pros and Cons of each approach:**

* `Array.prototype.concat()`:
	+ Pros: Simple and widely supported, especially in older browsers.
	+ Cons: Can lead to object creation overhead, as a new array object is created.
* Spread operator (`...`):
	+ Pros: Concise, modern, and efficient, with less object creation overhead compared to `concat()`.
	+ Cons: May not work correctly in older browsers that don't support ES6 features.
* `push()` method without using spread operator:
	+ Pros: Can be more memory-efficient than `concat()` or spread operator, especially for large arrays.
	+ Cons: Less readable and may lead to errors if not used carefully.

**Library usage:**

None of the test cases explicitly use any JavaScript libraries. However, it's worth noting that some browsers, like Chrome, have their own built-in polyfills for ES6 features, which might affect the results.

**Special JS feature or syntax:**

The spread operator (`...`) is a new ES6 feature introduced in 2015. It allows creating new arrays by spreading elements from an existing array or iterable. This feature was not available in older browsers and may not work correctly in them.

**Other considerations:**

* Browser compatibility: The test results are specific to Chrome 88 on Mac OS X 10.15.7. The performance of these approaches may vary across different browsers, versions, and platforms.
* Input size: The benchmark tests arrays with a fixed number of elements (3). The performance of these approaches can be affected by the size of the input array.

**Alternatives:**

If you're interested in testing other approaches for concatenating arrays, some alternatives could be:

* Using `Array.prototype.reduce()` to concatenate arrays.
* Implementing your own custom concatenation function.
* Testing different optimization techniques, such as caching or memoization.

Keep in mind that the performance differences between these approaches can be relatively small, and it's essential to consider the specific use case and requirements of your project when choosing an approach.

Related benchmarks:

Array.prototype.concat vs spread operator vs push without jQuery (version: 0)

Compare the new ES6 spread operator with the traditional concat() method and push

Comparing performance of: Array.prototype.concat vs spread operator vs Push

Created: 3 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):